The XKR is not without its flaws, and interior noise is near the top of the list. Supercharger whine has been virtually eliminated, but the 20-inch tires are a constant companion, rumbling over rough pavement, howling at speed, and generally making a nuisance of themselves (although we loved the grip they provided). But there’s a lot of other noise coming through as well, such as wind noise at the top of the windshield, and the rumble of the engine’s exhaust note. At least one source of irritating noise can be shut off: the lousy stereo.